Improvement in steam-generators



' ed i dini tial tant @utenti @ittica JOHN S.MULLIN, `OF NEWARK, NE W JE RSEY.

Letters Patent No. 86,435, dated February 2, 1869.

IMPROVEMENT IN STEAM-GENERATORS.

o all 'whom 'it may concern Be it known that I, JOHN S. ML'LLIN, of Newark, in t-he county of Essex, and Sta-te of New Jersey, have invented a new and useful Improvement in Locomotive. and other Boilers; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable'those skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this` specification.

This invention relates to new and useful improvements vin steam-boilers for locomotive and other engines; and

It consists in providing means for consuming the sparks and gases generated during the combustion of the fuel, by forcing the products of combustion from' the smoke-chamber or base of the chimney back to the fire-box in combination with atmospheric air.

It -alsolconsists in means provided for supplying the irc with air by other means, and in .a perforated adjustable diaphragm beneath the grate-bars, and in an air-chamber around the smoke-chamber, supplied with air by a blower attached to the boiler, and also in dampers or valves, so arranged as to confine the heat anc gases, all as hereinafter more fully described. v

My object in this invention is to do away with not only the smoke and cinder nuisance, but to avoid all danger of fire from sparks, and to save fuel, by prod u cing apelfect combustion ofthe smoke and gases.

The drawing represents a longitudinal vertical section oi'aboiler constructed according to my invention, the improvements being (as will be observed) attached to the boiler, and not relating to its internal formation.

A is the boiler. l

B is the tire-box.

C is the ash-pit.

D represents the hollow grate-bars, connected with the water-legs or lowerportion of the boiler.

The roof of the cab E is hollow, as seen at I?, and provided with a valve, F. l

G' represents one or m'ore tubes, connected with F, and with the ash-pit C.

In the forward movement of the locomotive, air will enter the chamber F, and be discharged into the ash-pit f under the adjustable perforated diaphragn'i H, ibi-med and operating similarly to a Venetian blind.

1 is the smoke-chamber, which contains an open cyl- --indcr, J, formed of a succession of conical rings, which are connected together by the plates fl The imcr edges ofthe rings lap by, indicated by the dotted lines. v

Between the outer casing K and this open cylinderis an annular air-chamber, L, into which air is forced by one or more rotary blowers, m, which blowers are driven by belts from pulleys and shafts connected with the exigirle or wheels ofthe locomotive in any convenient manner.

N 0 represent pulleys for this purpose.

lt will be seen that the air which is thus forced into the annular chamber Ii will take a direction toward the bonnet l), which covers the mout-h of the open cylinder J and smoke-chamber I, and conducts (when the chimney R is closed by the sliding valves or dampers S and T) not only the lair thus driven in, but the products of combustion into the tube U, which discharges them into the ash-pit C, beneath the Ven etian-blind diaphragm H.

The slats of this diaphragm are perforated with small holes, so that the air, smoke, and combustible gases oif communication between the smoke-chamber I and 'the chimney, and it will be seen that they may be adjustedso that more or less ofthe air, gases, and smoke may be discharged directly into the chimney, or retained and forced intoA the nre-box through the channel U.

For retaining the heated gases in the boiler-tubes, fire-box, and smoke-chamber, a proper gate or damper may be arranged in the tube orchannelU, or in any other desired position.

The direction given to the current of air from the blowers m, by the conical rings J', (or open cylinder J,) will cause sniicient vacuum -in the smoke-chamber to produce all the draught required.

But the steam-exhaust, (which is discharge-d into the smoke-stack through the pipe Vin the ordinary way,) may be used, when desired, for the purpose of increasing the draught, by opening the upper damper S.

' It will be seen that the. chimney proper is placed on the smoke-chamber, aud that the pipe V is of less diameter, leaving an annular ope-ning, which is closed or opened hy the damper S.- v

As this pipe V passes up into the chimney some dis tance, the opening of the damper would produce the same effect as in ordinary cases.Y

I claim as new, and desire to secure by Letters Patent- 1. The construction of the cylinderJ of conical rings, and its arrangement with reference to the blower m, pipe V, valvesS and T, bonnet I), and channel U, substantially set forth 2. The air-chamber' F, combined with the cab of the locomotive, with air-tubes Gr combined with the ashpit, whereby a current of air is forced into the ash-pit by the forward motion of the locomotive, substantially as described.

3. In combination with the steam-generator fire-box, when devices are employed for forcing air or gases beneath the lire-grate, the ladjustable pe'rtbrated Venetian-blind diaphragm H, substantially as described.

J. S. MULLDT.

Witnesses:

FRANK BLookLnY,

ALEX. F. ROBERTS. 

